Which additional set of changes should the developer make to the application to improve the application’s performance?

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In: DVA-C02
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A developer needs to migrate an online retail application to AWS to handle an anticipated increase in traffic.The application currently runs on two servers: one server for the web application and another server for the database.The web server renders webpages and manages session state in memory.The database server hosts a MySQL database that contains order details.When traffic to the application is heavy, the memory usage for the web server approaches 100% and the application slows down considerably.The developer has found that most of the memory increase and performance decrease is related to the load of managing additional user sessions.For the web server migration, the developer will use Amazon EC2 instances with an Auto Scaling group behind an Application Load Balancer.

Which additional set of changes should the developer make to the application to improve the application’s performance?

Use an EC2 instance to host the MySQL database. Store the session data and the application data in the MySQL database.

Use Amazon ElastiCache for Memcached to store and manage the session data. Use an Amazon RDS for MySQL DB instance to store the application data.

Use Amazon ElastiCache for Memcached to store and manage the session data and the application data.

Use the EC2 instance store to manage the session data. Use an Amazon RDS for MySQL DB instance to store the application data.

Explanations:

Hosting the MySQL database on an EC2 instance does not resolve the memory issues caused by session management on the web server. Additionally, storing session data in the MySQL database would increase database load and latency, which could further degrade performance during peak traffic.

Using Amazon ElastiCache for Memcached offloads session data management from the web server, reducing memory usage and improving performance. Amazon RDS for MySQL provides a managed database service that scales well, ensuring efficient handling of application data while improving reliability and maintenance.

While using Amazon ElastiCache for Memcached for session data is beneficial, storing both session and application data in ElastiCache is not appropriate. Memcached is not designed for persistent storage of application data, which is best suited for a relational database like MySQL. This option would lead to data loss in case of cache invalidation.

Using the EC2 instance store for session data is not recommended due to its ephemeral nature; data stored here would be lost if the instance is stopped or terminated. While Amazon RDS for MySQL is a suitable choice for application data, relying on instance store for sessions would introduce significant risk and instability in session management.

2025-10-19

1 Comment

  1. Larry
    Author

    I think the answer is:
    Use Amazon ElastiCache for Memcached to store and manage the session data. Use an Amazon RDS for MySQL DB instance to store the application data.

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